USN-3618-1: LibVNCServer vulnerability

USN-3618-1: LibVNCServer vulnerability

libvncserver vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

• Ubuntu 17.10
• Ubuntu 16.04 LTS
• Ubuntu 14.04 LTS

Summary

LibVNCServer could be made to crash, expose sensitive information, or run
programs if it received specially crafted network traffic.

Software Description

• libvncserver – vnc server library

Details

It was discovered that LibVNCServer incorrectly handled certain packet
lengths. A remote attacker able to connect to a LibVNCServer could possibly
use this issue to obtain sensitive information, cause a denial of service,
or execute arbitrary code.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 17.10

libvncclient1 – 0.9.11+dfsg-1ubuntu0.1

libvncserver1 – 0.9.11+dfsg-1ubuntu0.1

Ubuntu 16.04 LTS

libvncserver1 – 0.9.10+dfsg-3ubuntu0.16.04.2

Ubuntu 14.04 LTS

libvncserver0 – 0.9.9+dfsg-1ubuntu1.3

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart LibVNCServer
applications to make all the necessary changes.

References

• CVE-2018-7225

Source: USN-3618-1: LibVNCServer vulnerability